/Engine/Source/Runtime/Core/Public/Misc/Compression.h
Thread-safe abstract decompression routine. Uncompresses memory from compressed buffer and writes it to uncompressed buffer. UncompressedSize is expected to be the exact size of the data after decompression.
true if compression succeeds, false if it fails because CompressedBuffer was too small or other reasons
static bool UncompressMemory ( [FName](API\Runtime\Core\UObject\FName) FormatName, void * UncompressedBuffer, int32 UncompressedSize, const void * CompressedBuffer, int32 CompressedSize, ECompressionFlags Flags, int32 CompressionData )